| 单词 | mass number |
| 释义 | mass numberSEE SYNONYMS FOR mass number ON THESAURUS.COM noun Physics.the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. Symbol: A Origin of mass numberFirst recorded in 1920–25 Words nearby mass numbermass meeting, mass merchandiser, mass movement, mass murder, mass noun, mass number, mass observation, Masson disk, Massorete, massotherapy, mass peristalsis Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for mass numbermass number nounthe total number of neutrons and protons in the nucleus of a particular atomSymbol: A Also called: nucleon number Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for mass numbermass number The total number of protons and neutrons in the nucleus of an atom. For example, nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a mass number of 14. Isotopes of elements are distinguished by their mass number; for example, carbon-12 and carbon-14 have mass numbers of 12 and 14 respectively. Also called nucleon number Compare atomic mass atomic weight. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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